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Radio Frequency Identification (RFID) tags are small, cost-effective microchips that emit ID signals when queried by a reader, often serving as bar-code substitutes for goods management, theft detection, and more. However, their low computational power and ease of readability raise significant privacy concerns, such as ID leakage and location tracking. Our research at Sakurai Lab, Kyushu University, delves into these privacy issues and proposes solutions like re-encryption schemes and secure yoking proofs to protect user information and prevent unauthorized access after ownership changes.
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Security problems on RFID tags(short introduction) Sakurai Lab., Kyushu Univ. Junichiro SAITO saito@itslab.csce.kyushu-u.ac.jp
What is a Radio Frequency Identification（RFID） tag? • A small and inexpensive microchip that emits an ID in response to query from a reader • Used as a substitute for a bar code • management of goods and its circulation, theft detection • Little computational power • Easily readable by a reader • Be monitored communication between a RFID tag and a reader →Infringement of privacy
Privacy problems • ID leakage • An adversary can eavesdrop ID information • She can read by using a reader • leakage of information about belongings • ID tracing • If ID information on an RFID tag is fixed, an adversary can trace tag owner's activity • Infringement on location privacy price of the suit ○○ yen in wallet shoe size
Our research themes • Location privacy • We can use re-encryption scheme to change ID information • Yoking proof and grouping proof • We showed a replay attack against Juels's yoking proof • Owner changing • After changing owner, new owner doesn't want that old owner can read the RFID tag We proposed Re-encryption scheme with a check We proposed secure yoking proof by using a time stamp We proposed a key change scheme for changing owner
